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Full text of "Monthly performance report : Saddle Hill trust lot 73"

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SOLAR/1039-79/04 



Monthly 

Performance 

Report 



SADDLE HILL TRUST 

LOT 73 

APRIL 1979 




U.S. Department of Energy 




National Solar Heating and 
Cooling Demonstration Program 

National Solar Data Program 



NOTICE 

This report was prepared as an account of work sponsored by the United States 
Government. Neither the United States nor the United States Department of Energy, nor 
any of their employees, nor any of their contractors, subcontractors, or their employees, 
make any warranty, express or implied, or assume any legal liability or responsibility for 
the accuracy, completeness or usefulness of any information, apparatus, product or 
process disclosed, or represents that its use would not infringe privately owned rights. 



MONTHLY PERFORMANCE REPORT 

SADDLE HILL TRUST 
LOT 73 

APRIL 1979 

I. SYSTEM DESCRIPTION 

Saddle Hill Trust Lot 73 is a single-family residence in Medway, Massachusetts. 
Solar energy is used for preheating incoming city water. The system has an 
array of flat-plate collectors with a gross area of 45 square feet. The array 
faces south at an angle of 45 degrees to the horizontal. A 60 percent glycerol 
solution is used as the medium for delivering solar energy from the collector 
array to storage. Water is the transport medium that delivers solar energy to 
storage and to the domestic-hot-water (DHW) heater. Solar energy is stored in 
the basement in an 80-gallon preheat tank. This preheated city water is 
supplied, on demand, to a conventional 40-gallon DHW tank. When solar energy 
is insufficient to satisfy the hot water requirements, the gas-driven DHW 
heater provides auxiliary energy for water heating. The system, shown sche- 
matically in Figure 1, has two modes of solar operation. 

Mode 1 - Collector-to-Storage : This mode activates when a 40°F temperature 
difference exists between the collector and the preheat tank. Pump PI is on. 
This mode continues operating until the temperature difference drops to 20°F. 

Mode 2 - Storage- to-DHW Tank : This mode activates when there is a demand for 
hot water. Hot water from the top of the preheat tank is transferred to the 
DHW tank to replace the amount removed. Simultaneously, city water is auto- 
matically supplied to the preheat tank. 

II. PERFORMANCE EVALUATION 



INTRODUCTION 

The site was occupied in April and the solar energy system operated contin- 
uously during the month. Solar energy satisfied 45 percent of the DHW require- 
ments. The solar energy system incurred an electrical energy expense of 0.14 
million Btu and provided a fossil fuel energy savings of 1.1 million Btu. 

WEATHER CONDITIONS 

During the month, total incident solar energy on the collector array was 
1.7 million Btu for a daily average of 1244 Btu per square foot. This was 
below the estimated average daily solar radiation for this geographical area 
during April of 1334 Btu per square foot for a south-facing plane with a tilt 
of 45 degrees to the horizontal. The average ambient temperature during 
April was 47°F as compared with the long-term average for April of 49°F. 



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THERMAL PERFORMANCE 

System - During April the solar energy system performed somewhat poorer than 
expected. The expected performance was determined from a modified f -chart 
analysis using measured weather and subsystem loads as inputs. Solar energy 
collected was 1.0 million Btu versus an estimated 0.77 million Btu. Solar 
energy used by the system was estimated by assuming that all energy collected 
would be applied to the load. Actual solar energy used was 0.64 million Btu. 
System total solar fraction was 45 percent versus an estimated 53 percent. 

Collector - The total incident solar radiation on the collector array for the 
month of April was 1.7 million Btu. During the period the collector loop was 
operating, the total insolation amounted to 1.5 million Btu. The total col- 
lected solar energy for the month of April was 1.0 million Btu, resulting in a 
collector array efficiency of 59 percent, based on total incident insolation. 
Solar energy delivered from the collector array to storage was 0.91 million 
Btu. Energy loss during transfer from the collector array to storage was 
0.09 million Btu. This loss represented 9 percent of the energy collected. 
Operating energy required by the collector loop was 0.14 million Btu. 

Storage - Solar energy delivered to storage was 0.91 million Btu. There were 
0.64 million Btu delivered from storage to the DHW subsystem. Energy loss 
from storage was 0.26 million Btu. This loss represented 29 percent of the 
energy delivered to storage. The storage efficiency was 71 percent: This is 
calculated as the ratio of the sum of the energy removed from storage and the 
change in stored energy, to the energy delivered to storage. The average 
storage temperature for the month was 82°F. 

DHW Load - The DHW subsystem consumed 0.64 million Btu of solar energy and 
1.3 million Btu of auxiliary fossil fuel energy to satisfy a hot water load of 
1.3 million Btu. The solar fraction of this load was 45 percent. Losses from 
the DHW subsystem were 0.19 million Btu. A daily average of 61 gallons of DHW 
was consumed at an average temperature of 131 °F delivered from the tank. 

OBSERVATIONS 

Part of the 0.19 million Btu loss in the DHW subsystem was probably used to 
maintain tank temperature. 

ENERGY SAVINGS 

The solar energy system provided a fossil fuel energy savings of 1.1 million 
Btu, while incurring an electrical energy expense of 0.14 million Btu. 

III. ACTION STATUS 

No action is planned at this time. 







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